论文标题
用超短电子梁增强自种
Enhanced Self-seeding with Ultra-short Electron Beams
论文作者
论文摘要
我们描述了一种新方法，可以在自种的自由电子（FEL）激光器中产生强度稳定，高度相干，窄带X射线脉冲。该方法使用超短电子束来产生一个具有宽连贯带宽的单个尖峰FEL脉冲。然后，自种单色仪将该脉冲的狭窄光谱区域切出，以通过一小段电子束将其放大至完全饱和。与典型的自种相反，嘈杂的Sase脉冲的单色呈现会导致较大强度波动或多个频率，我们表明该方法会产生具有类似于完全相干光学激光器的统计特性的稳定，相干的FEL输出脉冲。
We describe a new method to produce intensity stable, highly coherent, narrow-band x-ray pulses in self-seeded free electron (FEL) lasers. The approach uses an ultra-short electron beam to generate a single spike FEL pulse with a wide coherent bandwidth. The self-seeding monochromator then notches out a narrow spectral region of this pulse to be amplified by a long portion of electron beam to full saturation. In contrast to typical self-seeding where monochromatization of noisy SASE pulses leads to either large intensity fluctuations or multiple frequencies, we show that this method produces a stable, coherent FEL output pulse with statistical properties similar to a fully coherent optical laser.
